org.apache.pig.backend.hadoop.executionengine.mapReduceLayer
Class KeyTypeDiscoveryVisitor
java.lang.Object
org.apache.pig.impl.plan.PlanVisitor<MapReduceOper,MROperPlan>
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.plans.MROpPlanVisitor
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.KeyTypeDiscoveryVisitor
public class KeyTypeDiscoveryVisitor
- extends MROpPlanVisitor
A visitor to figure out the type of the key for the map plan
this is needed when the key is null to create
an appropriate NullableXXXWritable object
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
KeyTypeDiscoveryVisitor
public KeyTypeDiscoveryVisitor(MROperPlan plan)
- Parameters:
plan
- The MROperPlan to visit to discover keyType
visitMROp
public void visitMROp(MapReduceOper mr)
throws VisitorException
- Overrides:
visitMROp
in class MROpPlanVisitor
- Throws:
VisitorException
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